Osteocephalus planiceps Cope, 1874, Proc. Acad. Nat. Sci. Philadelphia, 26: 122. Holotype: ANSP 11399, according to Malnate, 1971, Proc. Acad. Nat. Sci. Philadelphia, 123: 352. Type locality: "Nauta", Departamento Loreto, Peru.
Trachycephalus planiceps — Knauer, 1883, Naturgesch. Lurche: 110.
None noted.
Amazonian northeastern Peru, adjacent Ecuador, and Amazonian Colombia, as well as Jaś National Park, Amazonas, Brazil.
Removed from the synonymy of Osteocephalus taurinus by Duellman and Mendelson, 1995, Univ. Kansas Sci. Bull., 55: 344, where it had been placed by Trueb and Duellman, 1971, Occas. Pap. Mus. Nat. Hist. Univ. Kansas, 1: 31. Lynch, 2008, Rev. Acad. Colomb. Cienc. Exact. Fis. Nat., 32: 87-91, provided the Colombia records and discussed biogeography. Jungfer, 2010, Zootaxa, 2407: 46, suggeted that Brazilian specimens may be Osteocephalus vilarsi.
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